ade of work
for which it is designed. (_Mar. 5, '88._)

JOHN PICKARD, _Prin. of Portsmouth High School, N.H._: I like it
exceedingly. It is clear, straightforward, practical, and not too
heavy.

EZRA BRAINERD, _Pres. and Prof. of Physics, Middlebury College, Vt._:
I have looked it over carefully, and regard it as a much better book
for high schools than the former work. (_Feb. 6, 1888._)

JAMES A. DE BOER, _Prin. of High School, Montpelier, Vt._: I have not
only examined, but studied it, and consider it superior as a text-book
to any other I have seen. (_Feb. 10, '88._)

E. B. ROSA, _Teacher of Physics, English and Classical School,
Providence, R.I._: I think it the best thing in that grade published,
and intend to use it another year. (_Feb. 23, '88._)

G. H. PATTERSON, _Prin. and Prof. of Physics, Berkeley Sch.,
Providence, R.I._: A very practical book by a practical teacher.
(_Feb. 2, 1888._)

GEORGE E. BEERS, _Prin. of Evening High School, Bridgeport, Conn._:
The more I see of Professor Gage's books, the better I like them. They
are popular, and at the same time scientific, plain and simple, full
and complete. (_Feb. 18, 1888._)

ARTHUR B. CHAFFEE, _Prof. in Franklin College, Ind._: I am very much
pleased with the new book. It will suit the average class better than
the old edition.

W. D. KERLIN, _Supt. of Public Schools, New Castle, Ind._: I find that
it is the best adapted to the work which we wish to do in our high
school of any book brought to my notice.

C. A. BRYANT, _Supt. of Schools, Paris, Tex._: It is just the book for
high schools. I shall use it next year.

_Introduction to Chemical Science._

By R. P. WILLIAMS, Instructor in Chemistry in the English High
School, Boston. 12mo. Cloth. 216 pages. Mailing Price, 90 cents; for
introduction, 80 cents; Allowance for old book in exchange,
25 cents.

In a word, this is a working chemistry--brief but adequate. Attention
is invited to a few special features:--

1. This book is characterized by directness of treatment, by the
selection, so far as possible, of the most interesting and practical
matter, and by the omission of what is unessential.

2. Great care has been exercised to combine clearness with accuracy of
statement, both of theories and of facts, and to make the explanations
both lucid and concise.

3. The three great classes of chemical compounds--acids, bases, and
salts--are given more than usual prominence, and the arran